Advanced Skills in Modern Radiotherapy 2018

Why is delineation important?

• Radiotherapy planning is nowadays mostly based on delineation

• Constraints for dose distribution are used

• DVH are calculated based on the contours

• Field arrangements are becoming more complex

• An error in contouring will therefore translate in a systematic error all along the treatment and may have consequences: ➢ Jeopardizing treatment efficacy ➢ Impacting treatment toxicity